ASTM D2307-2007a Standard Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire《薄膜绝缘磁性圆电线的热稳定性用标准试验方法》.pdf
《ASTM D2307-2007a Standard Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire《薄膜绝缘磁性圆电线的热稳定性用标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D2307-2007a Standard Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire《薄膜绝缘磁性圆电线的热稳定性用标准试验方法》.pdf(9页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 2307 07aAn American National StandardStandard Test Method forThermal Endurance of Film-Insulated Round Magnet Wire1This standard is issued under the fixed designation D 2307; the number immediately following the designation indicates the year oforiginal adoption or, in the case of rev
2、ision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers determination of the thermalendurance of film-insulated round magnet wire
3、 in air atatmospheric pressure. It is not applicable to magnet wire withfibrous insulation, such as cotton or glass.1.2 The values stated in inch-pound units are to be regardedas the standard. The SI units in parentheses are provided forinformation only.1.3 This test method covers the evaluation of
4、thermalendurance by observing changes in response to ac proofvoltage tests. The evaluation of thermal endurance by observ-ing changes in other properties of magnet wire insulationrequires the use of different test methods.1.4 It is possible that exposure of some types of filminsulated wire to heat i
5、n gaseous or liquid environments in theabsence of air will give thermal endurance values differentfrom those obtained in air. Consider this possibility wheninterpreting the results obtained by heating in air with respectto applications where the wire will not be exposed to air inservice.1.5 It is po
6、ssible that electric stress applied for extendedperiods at a level exceeding or even approaching the dischargeinception voltage will change significantly the thermal endur-ance of film insulated wires. Under such electric stress condi-tions, it is possible that comparisons between materials willalso
7、 differ from those developed using this method.1.6 This test method is similar to IEC 60172. Differencesexist regarding specimen preparation.1.7 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard
8、to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 1676 Test Methods for Film-Insulated Magnet WireD 1711 Terminology Relating to Electrical InsulationD 3251 Test Method for Therma
9、l Endurance Characteristicsof Electrical Insulating Varnishes Applied Over Film-Insulated Magnet WireD 5423 Specification for Forced-Convection LaboratoryOvens for Evaluation of Electrical Insulation2.2 Other Standards:IEC 60172 Statistical Analysis of Thermal Life Test Data3IEEE 101 Statistical Ana
10、lysis of Thermal Life Test Data43. Terminology3.1 Definitions:3.1.1 temperature index, na number which permits com-parison of the temperature/time characteristics of an electricalinsulating material, or a simple combination of materials, basedon the temperature in degrees Celsius which is obtained b
11、yextrapolating the Arrhenius plot of life versus temperature to aspecified time, usually 20 000 h.3.1.2 thermal endurance, nan expression for the stabilityof an electrical insulating material, or a simple combination ofmaterials, when maintained at elevated temperatures for ex-tended periods of time
12、.3.2 Definitions of Terms Specific to This Standard:3.2.1 specimen failure time, nthe hours at the exposuretemperature that have resulted in a specimen failing the prooftest (see 9.1).3.2.2 thermal endurance cycle, none oven exposure pe-riod followed by a proof voltage test.3.2.3 time to failure, nt
13、he log average hours calculated fora set of specimens, calculated from the individual specimenfailure times at an exposure temperature (see 9.2).1This test method is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubco
14、mmittee D09.10 on Magnet Wire Insulation.Current edition approved Oct. 1, 2007. Published October 2007. Originallyapproved in 1964. Last previous edition approved in 2007 as D 2307 07.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm
15、.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from International Electrotechnical Commission (IEC), 3 rue deVaremb, Case postale 131, CH-1211, Geneva 20, Switzerland, http:/www.iec.ch.4Available from Institute of
16、 Electrical and Electronics Engineers, Inc. (IEEE),445 Hoes Ln., P.O. Box 1331, Piscataway, NJ 08854-1331, http:/www.ieee.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United
17、States.3.3 For definitions of terms related to electrical insulation,see Terminology D 1711.4. Summary of Test Method4.1 This test method specifies the preparation of specimens,the exposure of these specimens at elevated temperatures, andthe periodic testing of the specimens by applying a preselecte
18、dproof voltage.4.2 The cyclic exposure to temperature is repeated until asufficient number of specimens have failed to meet the prooftest, and the time to failure is calculated in accordance withSection 9. The test is carried out at three or more temperatures.A regression line is calculated in accor
19、dance with Section 10,and the time to failure values plotted on thermal endurancegraph paper (see Fig. 6) as a function of the exposuretemperature.5. Significance and Use5.1 This test method is useful in determining the thermalendurance characteristics and thermal indices of film-insulatedround magn
20、et wire in air (see 1.4) (see Test Method D 3251).This test method is used as a screening test before making testsof more complex systems or functional evaluation. It is alsoused where complete functional systems testing is not feasible.5.2 Experience has shown that film-insulated wire andelectrical
21、 insulating varnishes or resins can affect one anotherduring the thermal exposure process. Test Method D 3251provides indications on the thermal endurance for a combina-tion of insulating varnish or resin and film insulated wire. It ispossible that interaction between varnish or resin and filminsula
22、tion will increase or decrease the relative thermal life ofthe varnish and film insulated wire combination compared withthe life of the film insulated wire tested without varnish.5.3 The conductor type or the surface condition of theconductor will affect the thermal endurance of film-insulatedmagnet
23、 wire. This test method is used to determine the thermalendurance characteristics of film insulation on various kinds ofconductors. The use of sizes other than those specified in 7.1.1is permissible but is not recommended for determining thermalendurance characteristics.5.4 The temperature index det
24、ermined by this test method isa nominal or relative value expressed in degrees Celsius at20 000 h. It is to be used for comparison purposes only and isnot intended to represent the temperature at which the filminsulated wire could be operated.5.5 There are many factors that influence the results ob-
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